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buildah-unshare(1)	     General Commands Manual	      buildah-unshare(1)

NAME
     buildah-unshare - Run a command inside of a modified user namespace.

SYNOPSIS
     buildah unshare [options] [--] [command]

DESCRIPTION
     Launches  a process (by default, $SHELL) in a new user namespace.	The user
     namespace is configured so that the invoking user's UID and primary GID ap-
     pear to be UID 0 and GID 0, respectively.	Any ranges which match that user
     and group in /etc/subuid and /etc/subgid are also mapped in  as  themselves
     with the help of the newuidmap(1) and newgidmap(1) helpers.

     buildah  unshare  is useful for troubleshooting unprivileged operations and
     for manually clearing storage and other data related to images and contain-
     ers.

     It is also useful if you want to use the buildah mount command.  If an  un-
     privileged user wants to mount and work with a container, then they need to
     execute  buildah  unshare.   Executing buildah mount fails for unprivileged
     users unless the user is running inside a buildah unshare session.

OPTIONS
     --mount, -m [VARIABLE=]containerNameOrID

     Mount the containerNameOrID container while running command,  and	set  the
     environment  variable  VARIABLE to the path of the mountpoint.  If VARIABLE
     is not specified, it defaults to containerNameOrID,  which  may  not  be  a
     valid name for an environment variable.

EXAMPLE
     buildah unshare id

     buildah unshare pwd

     buildah unshare cat /proc/self/uid_map /proc/self/gid_map

     buildah  unshare rm -fr $HOME/.local/share/containers/storage /run/user/`id
     -u`/run

     buildah unshare --mount containerID sh  -c  'cat  ${containerID}/etc/os-re-
     lease'

     buildah unshare --mount root=containerID sh -c 'cat ${root}/etc/os-release'

     If  you  want  to	use buildah with a 'mount' command then you can create a
     script that looks something like:

     cat > buildah-script.sh << _EOF
     #!/bin/bash
     ctr=$(buildah from scratch)
     mnt=$(buildah mount $ctr)
     dnf -y install --installroot=$mnt --use-host-config --setopt "*.countme=false" PACKAGES
     dnf -y clean all --installroot=$mnt
     buildah config --entrypoint="/bin/PACKAGE" --env "FOO=BAR" $ctr
     buildah commit $ctr imagename
     buildah unmount $ctr
     _EOF
     chmod +x buildah-script.sh

     Then execute it with:

     buildah unshare ./buildah-script.sh

SEE ALSO
     buildah(1), buildah-mount(1),  namespaces(7),  newuidmap(1),  newgidmap(1),
     user_namespaces(7)

buildah 			    June 2018		      buildah-unshare(1)

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